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Create an outline of your article based on the following description.

Input: This article is going to focus on the importance of social media in modern day marketing.

Output:
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I. Introduction
II. Benefits of Social Media in Marketing
A. Increasing Reach
B. Instant Engagement
C. Creating Personalized Experiences
III. Challenges of Social Media Marketing 
A. Risk of Negative Comments 
B. Low Attention Spans
IV. The Future of Social Media Marketing 
V. Conclusion